Friction-modifying additives for slideway lubricants

A friction-modifying additive composition for a slideway lubricant comprising a mixture of at least one polymeric ester of certain dibasic and monobasic acids with selected organo phosphorus compounds.

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Claims

1. A slideway lubricant additive composition consisting essentially of:

(a) at least one polymeric ester of a mixture of dibasic and monobasic acids wherein each acid contains 5 to 22 carbon atoms and wherein the ester group is an aliphatic group and wherein the resultant polymer has a weight average molecular weight (M.sub.w) from about 50,000 to 3,000,000 and having an Acid Number of about 0.5 to about 30;
(b) at least one organo phosphorous compound selected from the group consisting of dialkyl hydrogen phosphites, trialkyl phosphites, aryl organo phosphites, alkyl-aryl phosphates, and alkyl amine salt of organo phosphoric acid; and
(c) a sufficient coupling agent amount of petroleum oil to contain (a) and (b) in a solution; wherein the weight ratio of said polymeric ester to said organo phosphorus compound is from about 2:1 to about 12:1 and wherein said viscosity of said petroleum oil is ISO-22 to ISO-680.

2. The additive composition of claim 1 wherein said polymeric ester is a mixed ester of more than one monobasic acid with one dibasic acid.

3. The additive composition of claim 1 wherein each acid in (a) contains 6 to 18 carbon atoms.

4. The additive composition of claim 1 wherein polymeric ester has a M.sub.w of about 150,000 and an Acid Number of about 16 to 24 and is a pentaerythritol initiated polymer of a mixture of stearic acid, coconut fatty acids and adipic acid.

5. The additive composition of claim 1 wherein said polymeric ester has a M.sub.w from about 1,500,000 to about 2,500,000 and an Acid Number from about 0.5 to about 3.

6. The additive composition of claim 1 wherein said polymeric ester has a M.sub.w of 2,100,000, an Acid Number of 0.5 to 3 and is a pentaerythritol initiated polymer of a mixture of coconut fatty acids and adipic acid.

7. The additive composition of claim 1 wherein said organo phosphorus compound is an alkyl amine salt of an organo phosphoric acid.

8. The additive composition of claim 7 wherein said alkyl amine salt of an organo phosphoric acid is a mixture of tridecyl phosphate and branched 3-tridecyloxy-1-propanamine.

9. The additive composition of claim 1 wherein the weight ratio of polymeric ester to phosphoric compound is from 4:1 to about 8:1.

10. The additive composition of claim 1 wherein the petroleum oil has a viscosity of ISO-22 to ISO-220.

11. The additive composition of claim 1 wherein the amount of said petroleum oil in said additive composition is from about 10% to about 70% by weight of the additive composition.

12. A slideway lubricant composition comprising a lubricant base stock and about 0.75% to about 4% by weight of the additive composition of claim 1.

13. The slideway lubricant composition of claim 12 further comprising a tackifier.

14. The slideway lubricant composition of claim 13 wherein said tackifier is oil-solubilized polyisobutylene.

15. The slideway lubricant composition of claim 13 wherein said tackifier is present in an amount from 0.25% to about 4%, based on the total weight of the slideway lubricant.

Referenced Cited
U.S. Patent Documents
4061581 December 6, 1977 Leleu et al.
4116877 September 26, 1978 Outten et al.
4130494 December 19, 1978 Shaub et al.
4601840 July 22, 1986 Zehler et al.
4968452 November 6, 1990 Seiki
5151205 September 29, 1992 Culpon, Jr.
5360565 November 1, 1994 Junga
Other references
  • Elco 313 slideway lubricant additive product brochure--The Elco Company, Cleveland, Ohio--Jan., 1993. Gateway Additive Co. product brochure entitled "Stability of SYN-ESTER and ADDCO Esters"--Sep., 1992. Gateway Additive Co. product brochure entitled "SYN-ESTER GY Series"--Oct., 1992. Gateway Additive Co. product brochure entitled "SYN-ESTER.RTM. GY-35 and GY-500"--Apr., 1995. Gateway Additive Co. product brochure entitled "ADDCO 360-P"--Oct., 1992.
Patent History
Patent number: 5798322
Type: Grant
Filed: Aug 30, 1996
Date of Patent: Aug 25, 1998
Assignee: Gateway Additive Company (Spartanburg, SC)
Inventors: William Brannen (Westlake, OH), Aaron Myers (Spartanburg, SC), Harish Patel (Spartanburg, SC), Philip R. Miller (Spartanburg, SC)
Primary Examiner: Margaret Medley
Attorney: William A. Wiggin & Dana Simons
Application Number: 8/705,614